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List of AVB-capable Ethernet switches

Tesira devices make use of Audio Video Bridging (AVB) to deliver audio signals between Tesira devices. The traffic shaping functions of AVB are managed by an AVB bridge (i.e., an AVB-enabled Ethernet switch). Therefore, any switches used for AVB traffic are required to support AVB functionality.

All switches described in this article have been informally tested with Biamp Tesira products1. Due to differences in switch designs and specifications (port speed, backplane bandwidth, CPU speed, etc.), each switch has different limitations on the maximum number of AVB streams and channels it can handle. Contact the switch manufacturer for more detailed information.

Extreme Networks

extreme_summit_jpeg.jpgExtreme Networks AVNu certified AVB-enabled switches include select Summit® series switches, and scale from Gigabit to 10/40GbE, copper/fiber, with or without PoE+. Please visit www.extremenetworks.com for more details.

AVB support is available on Extreme Networks switches running ExtremeXOS® version 15.3 or later with the purchase of an AVB feature pack. Please contact Extreme Networks or Extreme Networks Channel Partners for more details.

To enable AVB functions on Extreme networks switches, please see Enable AVB on Extreme Network Switches.

Netgear

netgear gs724t.jpgSelect models of the Netgear GS7-series support AVB functionality. All Netgear switches require an EAV license in order to use the AVB functionality. All GS724Tv4 switches that are purchased from Biamp Systems already have this license installed. Switches purchased from other vendors may require this license to be purchased and installed separately. All AVB-capable Netgear switches are shown in the table below:

Model Number # of Ports Port speed PoE Firmware Version Setup Instructions
GS716Tv3 16 1Gbps No 6.3.1.4 Link
GS724Tv3 (discontinued) 24 1Gbps No 5.0.3.5 Link
GS724Tv4 24 1Gbps No 6.3.1.4 Link
GS748Tv5 48 1Gbps No 6.3.1.4 Link

Note that the Netgear AVB switches cannot be used in conjunction with AVB switches from other manufacturers. Additionally, the GS724Tv3 switch cannot be used in the same network as other Netgear switches.  When using Netgear AVB switches, all switches in the network that are used for AVB traffic must be the same manufacturer and model.

Netgear switches are not Avnu certified and are suitable for small to mid-sized AVB implementations. The use of a single switch for AVB device counts greater than 16 should be avoided regardless of port density, due to the high CPU demands placed on a switch in managing AVB streams and ports.

Biamp dealers can purchase the Netgear GS724Tv4 switch from Biamp Systems, in which case the switch will be fully configured for AVB out of the box. Any switch not purchased from Biamp Systems will need to be configured for AVB (see Setup Instructions links in the table above).

GBIC fiber transciever

The Netgear GS7xxT switches include two GBIC ports for fiber optic connections. Compatible GBIC modules for these switches include:

  • Netgear AGM731F : 1000BASE-SX (Multi mode; up to 550m with 50/125 cable, up to 275m with 62.5/125 cable)
  • Netgear AGM732F : 1000BASE-LX (Single mode; up to 10km with 9/125 cable)
  • Netgear AGM733 : 1000BASE-ZX (Single mode; up to 70km with 9/125 cable)
  • Avago AFBR-5715APZ
  • Diablo Cable GE-SFP-SX - Multi mode 2Km Item # 18530
  • Diablo Cable GE-SFP-LX/LH Single mode - 10Km Mini GBIC Item # 18531

MOTU

motu.pngMOTU offers a 5-port AVB switch that has been confirmed to work with AVB-enabled Biamp Tesira devices. The model number of the switch is simply "AVB Switch". See MOTU's website for more information.

Biamp has informally tested the switch and determined that it is capable of handling at least 36 AVB streams, for a total of 144 AVB audio channels. There may be additional channel/stream restrictions on networks that consist of multiple MOTU switches. For systems that use multiple MOTU switches at the edge of a larger AVB network, Biamp recommends using a higher-capacity AVB switch (such as an Extreme Networks switch) as the core switch. The MOTU switch cannot be used in conjunction with a Netgear AVB switch.

Biamp recommends the MOTU switch primarily for smaller installations with relatively light AVB usage. Biamp does not recommend building larger AVB networks using multiple MOTU switches connected directly to each other, or using the MOTU switch in systems with heavy AVB usage. Fiber media converters are not recommended for use with MOTU AVB. 

Media converters

AVB can be converted to run over fiber optic cables using media converters. However, it is important to use true media converters that do not have integrated Ethernet switches built into them. The following media converters have been informally tested with Tesira products:1

  • Diablo Cable 18243 - 1310nm / 10KM GBIC 10/100/100Base TX to 1000Base FX

(Please ensure the unit is used in 'converter' mode rather than 'switch' mode. SW-1 should be set to OFF, SW-2 should be set to ON.)

  • Luxcom OM1000E - 1000BASE-T to 1000BASE-X

The length of the fiber line and media converter will have an impact on propagation delay. The peer delay threshold in Tesira is configurable up to 10,000 nanoseconds. If the link propagation delay exceeds this threshold, AVB clocking will not function correctly. Both the switch and Tesira must have their peer delay threshold configured to account for the media conversion. MOTU AVB switches do not have a configurable peer delay and should not be used with fiber media convertors.

Further reading

 

1. Manufacturer specifications can change without notice. Biamp Systems strives to keep this list up to date, but is not always made aware of changes made by third parties to the Ethernet switches referenced, and therefore Biamp Systems cannot guarantee compatibility with any of the products listed on this page.